resgen.swift/Sources/ToolCore/GeneratorChecker.swift

//
//  GeneratorChecker.swift
//  
//
//  Created by Thibaut Schmitt on 22/12/2021.
//

import Foundation

public class GeneratorChecker {
    
    /// Return `true` if  inputFile is newer than extensionFile, otherwise `false`
    public static func shouldGenerate(force: Bool, inputFilePath: String, extensionFilePath: String) -> Bool {
        guard force == false else {
            return true
        }
        
        // If inputFile is newer that generated extension -> Regenerate
        let extensionFileURL = URL(fileURLWithPath: extensionFilePath)
        let inputFileURL = URL(fileURLWithPath: inputFilePath)
        
        let extensionRessourceValues = try? extensionFileURL.resourceValues(forKeys: [URLResourceKey.contentModificationDateKey])
        let inputFileRessourceValues = try? inputFileURL.resourceValues(forKeys: [URLResourceKey.contentModificationDateKey])
        
        if let extensionModificationDate = extensionRessourceValues?.contentModificationDate,
           let inputFileModificationDate = inputFileRessourceValues?.contentModificationDate {
            if inputFileModificationDate >= extensionModificationDate {
                print("Input file is newer that generated extension.")
                return true
            } else {
                return false
            }
        }
    
        // ModificationDate not available for both file
        print("⚠️ Could not compare file modication date. ⚠️")
        return true
    }
    
}